I am often curious as to why the Monk, which is essentially a Martial Artist only a d8 for Hit Points?
Classes like the Fighter; Paladin; Ranger get a d10 because it is supposed to symbolize their rugged life style and hard training.
But, have you ever seen a Shaolin Monk or any other martial artist where training is their life style, which the D&D Monk is obviously based off of those life style choices and troupes.
When one lives that life style they train for a large portion of the day, putting their body to extreme limits. Not only that, but you spar constantly. Heck, even in the USA when you take a martial art, such as Taekwondo for example (which I did, I also did Boxing; Brazilian Jiu-Jitsu; Hapkido), you spar 3 times a week minimum, except BJJ and Hapkido where you need an opponent to learn moves with every class
Well, anyways, enough of my rambling, thoughts?